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An Indoor Wireless Positioning Method Using Fingerprint Method

An indoor wireless and positioning method technology, applied in wireless communication, electrical components, transmission systems, etc., can solve the problems of heavy manual labor workload, inability to guarantee the accuracy of interpolation point information, and low work efficiency

Active Publication Date: 2016-02-10
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

This leads to a large amount of manual labor and low work efficiency in the offline stage in order to obtain high-precision positioning effects
In addition, some positioning methods use the interpolation method to construct the fingerprint library, but in this method, the accuracy of the interpolation point information cannot be guaranteed

Method used

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  • An Indoor Wireless Positioning Method Using Fingerprint Method
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  • An Indoor Wireless Positioning Method Using Fingerprint Method

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Embodiment Construction

[0027] This indoor wireless positioning method using the fingerprint method includes an offline training phase and an online positioning phase,

[0028] The offline training phase consists of the following steps:

[0029] (1) Establish indoor environment and collect signal strength data;

[0030] (2) Construct the original fingerprint library with low sampling rate;

[0031] (3) Reconstruct the original fingerprint database through the low-rank (Low-rank, LR) matrix filling model, and the low-rank matrix filling model is formula (1)

[0032] minrank(X) s.t.A(X)=B(1)

[0033] Among them, A(X) is a template operator, X is a measurement matrix containing all sampling points, each element X(i, j) represents the signal strength received by a sampling point (i, j) from a certain access point AP, A(X)=B, only relatively sparse sampling points that have been actually measured have effective signal strength values, A(X) is defined as the matrix Q of formula (2),

[0034]

[0035...

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Abstract

The invention discloses an indoor wireless positioning method by utilizing fingerprint technique. The indoor wireless positioning method by utilizing the fingerprint technique largely lowers the requirements for the density of sampling points, enriches distribution information of signal strength, lightens the workload, and keeps high-precision positioning results. The indoor wireless positioning method by utilizing the fingerprint technique comprises an off-line training phase and an on-line training phase. The off-line training phase includes the following steps: firstly, an indoor environment is set up and signal strength data are acquired; secondly, an original fingerprint database with a low sampling rate is constructed; and thirdly, the original fingerprint database is reconstructed through a low-order matrix fill model, the low-order matrix fill model is minrank (X) s.t.A(X) = B. In the on-line training phase, signal strength vectors used for testing and the signal strength vector of each sampling point in the reconstructed fingerprint database are compared and matched, and position coordinates of a present position are estimated by utilizing the point coordinates of the known sampling points to obtain on-line positioning coordinates.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning, and in particular relates to an indoor wireless positioning method using a fingerprint method. Background technique [0002] At present, location-based services and a series of applications brought about by them are attracting more and more people's attention, and mobile users' requirements for locality and immediacy of location information are increasing day by day. Events of interest to many users, such as environmental monitoring, logistics management, and fire reports, must be combined with location information to be useful. At present, the relatively mature positioning method has GPS technology, which is widely used in outdoor positioning, and the positioning accuracy can reach about 10 meters. Indoors, due to the influence of factors such as walls, the positioning accuracy is difficult to meet people's needs. Therefore, obtaining high-precision positioning results in some spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04W64/00
Inventor 孙艳丰胡永利周薇
Owner BEIJING UNIV OF TECH
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